DC METRO AREA IS GONNA BE VERY HARD TO FIND, SINCE THOSE 3 ONLY AIRPOSTS
ARE UNDER DC ADIZ ZONE.
YOU CAN TRY
Welcome to Aviation Adventures -- The Flight School Pilots Love, I USED TO WORK THERE, THAT'S THE BEST SCHOOL AROUND, AT THE MANASSAS AIRPORT (HEF).
ALSO, YOU CAN FIND SEVERAL DIFFERENT SCHOOLS AT HEF.
GOOD LUCK